The fossil belongs to the Galeaspida, a group of jawless vertebrates defined by their heavy, helmet-like head shields. What Zhang held in her hands, however, was unlike any previously recorded. Protruding from the sides of the stone shield were two short, wing-like processes. They mirrored, with a strange and ancient precision, the feathered ear-tufts of a short-eared owl. This morphological signature led the research team to name the species Duanerwuxiajiaoyu.
For the young researcher, the find was more than a taxonomic entry. It represented a physical bridge between the primitive forms of her field and the more advanced species that followed. The "ears" of this fish provide the first concrete evidence for a hypothesis formulated in 1992 by the academician Zhu Min, regarding how these ancient protectors developed their rostral structures.
Under the guidance of Gai Zhikun at the Institute of Vertebrate Paleontology and Paleoanthropology, Zhang’s work connects the present to a lineage of Chinese scholarship. The paper, published in Vertebrata PalAsiatica, carries a quiet, personal tribute in its margins. It is dedicated to Zhang Miman, a pioneer of the field, on the occasion of her 90th birthday.
In the laboratory, the stone remains cool to the touch, a heavy fragment of the Lochkovian Stage. To look at the short-eared processes is to see a moment of transition frozen in the Devon mud—a testament to a time when the waters of Yunnan were a shallow coastal expanse, and the architecture of life was still experimenting with its own form.